Web interfaces not working

I setup my XBMC to allow control over HTTP, but when I go to the page on another computer I can log in, but it will only show the topbar (logo,remote,movies,tvshows and music) and clicking these buttons doesn't do anything. I also tried XWMM and again, I can see the interface but no movies or data at all.

I already deleted the database, having XBMC build a new one, but this didn't help.
I can however use the official iphone remote to start any video. This does show all my videos.